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苏联查波罗什变压器厂把麻花钻切削部分的几何形状改进为带曲线的主切削刃1。其刃磨半径R=1.05d,式中d为钻头直径,见附图a。切削刃的半径形状是借助刃磨钻头夹具(发明证书867613)得到的。现在已研制成麻花钻切削部分新的曲线几何形状,就是在主切削刃1和辅助切削刃2的连接处有一个带附加倒圆的切削刃3,见附图b。它的半径r<0.5d。该钻头比标准的钻头寿命长。加工钢材时,此刀具寿命比标准磨削的钻头要提高1.6～6倍,而加工铸
The Soviet Union Chaoporoche Transformer Factory to twist the geometry of the cutting part of the improvement with a curved main cutting edge 1. The grinding radius R = 1.05d, where d is the drill diameter, see Figure a. The shape of the radius of the cutting edge is obtained using a sharpening bit fixture (Certificate of Invention 867613). A new curvilinear geometry has now been developed for the twist-drill cutting portion where there is an additional rounded cutting edge 3 at the juncture of the main cutting edge 1 and the secondary cutting edge 2, see Figure b. Its radius r <0.5d. The drill bit longer than the standard drill bit. Processing steel, the tool life than the standard grinding bit to be increased 1.6 to 6 times, while the processing of cast